Peering into Jupiter
نویسنده
چکیده
Attaining in situ data from planets in our solar system is an extremely difficult undertaking. Decades of planning go into designing missions, and careful consideration is made for what measurements should be made to yield the greatest scientific gain, and to make the cost and risks worthwhile. NASA’s Galileo mission, whose detailed planning began in 1970s, studied the Jovian system from 1995 to 2003. The Galileo entry probe was released from the main spacecraft, and plummeted into Jupiter’s atmosphere at 48 km/s on December 7, 1995. The data that was returned on the abundances of atoms and molecules in the planet’s atmosphere are unique constraints on our quantitative understanding of the interior structure, thermal evolution, and formation of the planet. Since Jupiter is our prototype giant planet, in a class that now numbers nearly 300 “gas giants” in other planetary systems, this data is even more valuable than it was 15 years ago. In a recent work in Physical Review Letters[1], Hugh Wilson and Burkhard Militzer from the University of California at Berkeley, US, have used an ab initio calculation of the mixing properties of noble gases under extreme conditions to explain one of the more curious measurements from the Galileo probe—the low abundances of the two lightest noble gases.
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تاریخ انتشار 2010